假設你已經(jīng)有自己的域名，因為微信公眾號和微信回調(diào)都需要域名

根據(jù)官方文檔，主要流程如下：

（1）引導用戶進入授權頁面同意授權，獲取code

（2）通過code換取網(wǎng)頁授權access_token（與基礎支持中的access_token不同）

（3）刷新access_token（如果有需要）

（3）通過網(wǎng)頁授權access_token和openid獲取用戶基本信息

提示：以下是本篇文章正文內(nèi)容，下面案例可供參考

代碼如下（示例）：

/** * 公眾號微信登錄授權 */ @RequestMapping('/wxLogin') public void wxLogin(HttpServletResponse response) throws IOException { //這個url的域名必須在公眾號中進行注冊驗證，這個地址是成功后的回調(diào)地址 String backUrl = 'http://7ca0c439f61c.ngrok.io/callback';//使用自己的域名 // 第一步：用戶同意授權，獲取code //請求地址 snsapi_base snsapi_userinfo String url = 'https://open.weixin.qq.com/connect/oauth2/authorize' + '?appid=' + HttpClientUtil.APPID + '&redirect_uri=' + URLEncoder.encode(backUrl,'utf-8') + '&response_type=code' + '&scope=snsapi_userinfo' + '&state=STATE#wechat_redirect'; logger.info('forward重定向地址{' + url + '}'); //必須重定向，否則不能成功 response.sendRedirect(url); }備注：在前端頁面直接加載url 就可以出現(xiàn)二維碼界面了。直接用的微信的頁面，也可以根據(jù)自己的愛好進行設計頁面 /** * 公眾號微信登錄授權回調(diào)函數(shù) */ @RequestMapping('/callback') public UserLoginRes callback(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { UserLoginRes userLoginRes = new UserLoginRes(); try{ WXUserInfoReq weixinUserInfo = new WXUserInfoReq(); /*start 獲取微信用戶基本信息*/ String code = req.getParameter('code'); //第二步：通過code換取網(wǎng)頁授權access_token String url = 'https://api.weixin.qq.com/sns/oauth2/access_token?' + 'appid=' + HttpClientUtil.APPID + '&secret=' + HttpClientUtil.APPSECRET + '&code=' + code + '&grant_type=authorization_code'; System.out.println(url); String result = HttpClientUtil.doGet(url); JSONObject jsonObject = JSON.parseObject(result); /* { 'access_token':'ACCESS_TOKEN', 'expires_in':7200, 'refresh_token':'REFRESH_TOKEN', 'openid':'OPENID', 'scope':'SCOPE' } */ String openid = jsonObject.getString('openid'); String access_token = jsonObject.getString('access_token'); //第三步驗證access_token是否失效； String chickUrl = 'https://api.weixin.qq.com/sns/auth?access_token=' + access_token + '&openid=' + openid; String resultInfo = HttpClientUtil.doGet(chickUrl); JSONObject chickuserInfo = JSON.parseObject(resultInfo); System.out.println(chickuserInfo.toString()); if (!'0'.equals(chickuserInfo.getString('errcode'))) { String refreshInfo1 = HttpClientUtil.doGet(chickUrl); JSONObject refreshInfo = JSON.parseObject(refreshInfo1); /* { 'access_token':'ACCESS_TOKEN', 'expires_in':7200, 'refresh_token':'REFRESH_TOKEN', 'openid':'OPENID', 'scope':'SCOPE' } */ access_token = refreshInfo.getString('access_token'); } // 第四步：拉取用戶信息 String infoUrl = 'https://api.weixin.qq.com/sns/userinfo?access_token=' + access_token + '&openid=' + openid + '&lang=zh_CN'; JSONObject userInfo = JSON.parseObject(HttpClientUtil.doGet(infoUrl)); /* { 'openid':' OPENID', 'nickname': NICKNAME, 'sex':'1', 'province':'PROVINCE' 'city':'CITY', 'country':'COUNTRY', 'headimgurl': 'http://wx.qlogo.cn/mmopen/g3MonUZtNHkdmzicIlibx6iaFqAc56vxLSUfpb6n5WKSYVY0ChQKkiaJSgQ1dZuTOgvLLrhJbERQQ4eMsv84eavHiaiceqxibJxCfHe/46', 'privilege':[ 'PRIVILEGE1' 'PRIVILEGE2' ], 'unionid': 'o6_bmasdasdsad6_2sgVt7hMZOPfL' } */ System.out.println(userInfo.getString('openid') + ':' + userInfo.getString('nickname') +':' + userInfo.getString('sex')); }catch (Exception e){ e.printStackTrace(); userLoginRes.setResult('NO'); userLoginRes.setRtnErrId('ERROR'); userLoginRes.setRtnErrMsg(e.getMessage()); } return userLoginRes; }使用到的HttpClientUtil工具類

代碼如下（示例）：

public class HttpClientUtil { //appid、secret為自己公眾號平臺的appid和secret public static final String APPID='xxxxxxx'; public static final String APPSECRET ='xxxxxxx'; public static String doGet(String url, Map<String, String> param) { // 創(chuàng)建Httpclient對象 CloseableHttpClient httpclient = HttpClients.createDefault(); String resultString = ''; CloseableHttpResponse response = null; HttpGet httpGet = null; try { // 創(chuàng)建uri URIBuilder builder = new URIBuilder(url); if (param != null) { for (String key : param.keySet()) { builder.addParameter(key, param.get(key)); } } URI uri = builder.build(); // 創(chuàng)建http GET請求 httpGet = new HttpGet(uri); httpGet.setHeader('Host', 'api.weixin.qq.com'); httpGet.setHeader('User-Agent', 'Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko'); httpGet.setHeader('Accept', 'text/html, application/xhtml+xml, */*'); httpGet.setHeader('Accept-Encoding', 'gzip, deflate, br'); httpGet.setHeader('Connection', 'keep-alive'); httpGet.setHeader('Accept-Language', 'zh-CN'); httpGet.setHeader('Cache-Control', 'no-cache'); // 執(zhí)行請求 response = httpclient.execute(httpGet); // 判斷返回狀態(tài)是否為200 if (response.getStatusLine().getStatusCode() == 200) { resultString = EntityUtils.toString(response.getEntity(), 'UTF-8'); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (response != null) { response.close(); } httpGet.releaseConnection(); httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } return resultString; } public static String doGet(String url) { return doGet(url, null); } public static String doPost(String url, Map<String, String> param) { // 創(chuàng)建Httpclient對象 CloseableHttpClient httpClient = HttpClients.createDefault(); CloseableHttpResponse response = null; String resultString = ''; try { // 創(chuàng)建Http Post請求 HttpPost httpPost = new HttpPost(url); // 創(chuàng)建參數(shù)列表 if (param != null) { List<NameValuePair> paramList = new ArrayList<>(); for (String key : param.keySet()) { paramList.add(new BasicNameValuePair(key, param.get(key))); } // 模擬表單 UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList); httpPost.setEntity(entity); } // 執(zhí)行http請求 response = httpClient.execute(httpPost); resultString = EntityUtils.toString(response.getEntity(), 'utf-8'); } catch (Exception e) { e.printStackTrace(); } finally { try { response.close(); } catch (IOException e) { e.printStackTrace(); } } return resultString; } public static String doPost(String url) { return doPost(url, null); } public static String doPostJson(String url, String json) { // 創(chuàng)建Httpclient對象 CloseableHttpClient httpClient = HttpClients.createDefault(); CloseableHttpResponse response = null; String resultString = ''; try { // 創(chuàng)建Http Post請求 HttpPost httpPost = new HttpPost(url); // 創(chuàng)建請求內(nèi)容 StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON); httpPost.setEntity(entity); // 執(zhí)行http請求 response = httpClient.execute(httpPost); resultString = EntityUtils.toString(response.getEntity(), 'utf-8'); } catch (Exception e) { e.printStackTrace(); } finally { try { response.close(); } catch (IOException e) { e.printStackTrace(); } } return resultString; } public static String doGetStr(String httpurl) { HttpURLConnection connection = null; InputStream is = null; BufferedReader br = null; String result = null;// 返回結果字符串 try { // 創(chuàng)建遠程url連接對象 URL url = new URL(httpurl); // 通過遠程url連接對象打開一個連接，強轉成httpURLConnection類 connection = (HttpURLConnection) url.openConnection(); // 設置連接方式：get connection.setRequestMethod('GET'); // 設置連接主機服務器的超時時間：15000毫秒 connection.setConnectTimeout(15000); // 設置讀取遠程返回的數(shù)據(jù)時間：60000毫秒 connection.setReadTimeout(60000); //設置請求頭 connection.setRequestProperty('Host', 'api.weixin.qq.com'); connection.setRequestProperty('User-Agent', 'Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko'); connection.setRequestProperty('Accept', 'text/html, application/xhtml+xml, */*'); connection.setRequestProperty('Accept-Encoding', 'gzip, deflate, br'); connection.setRequestProperty('Connection', 'keep-alive'); connection.setRequestProperty('Accept-Language', 'zh-CN'); connection.setRequestProperty('Cache-Control', 'no-cache'); // 發(fā)送請求 connection.connect(); // 通過connection連接，獲取輸入流 if (connection.getResponseCode() == 200) { is = connection.getInputStream(); // 封裝輸入流is，并指定字符集 br = new BufferedReader(new InputStreamReader(is, 'UTF-8')); // 存放數(shù)據(jù) StringBuffer sbf = new StringBuffer(); String temp = null; while ((temp = br.readLine()) != null) { sbf.append(temp); sbf.append('rn'); } result = sbf.toString(); } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { // 關閉資源 if (null != br) { try { br.close(); } catch (IOException e) { e.printStackTrace(); } } if (null != is) { try { is.close(); } catch (IOException e) { e.printStackTrace(); } } connection.disconnect();// 關閉遠程連接 } return result; } }最后根據(jù)實際業(yè)務處理用戶登錄

//3.根據(jù)uuid查詢用戶是否存在，如果存在直接登錄。如果不存在則自動注冊，在登錄 UserInfoModel userInfoByWechat = iUserDao.getUserInfoByWechat(userInfoStr.get('unionid').toString()); if (userInfoByWechat != null) { return ReturnMessage.success(0,'獲取成功',userInfoByWechat); } //4.數(shù)據(jù)庫添加用戶信息 String username = userInfoStr.get('nickname').toString(); String unionid = userInfoStr.get('unionid').toString(); UserInfoBean userInfoBean = new UserInfoBean(); userInfoBean.setUuid(unionid); userInfoBean.setUsername(username); // 微信登錄 userInfoBean.setStatus(2); iUserDao.insertUser(userInfoBean); //5.根據(jù)uuid查詢新注冊的用戶信息 UserInfoModel userInfoModel= iUserDao.getUserInfoByWechat(unionid); if (userInfoModel == null) { return ReturnMessage.fail(400,'用戶添加失敗，請重新操作'); }

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